Pneumatic shock-absorber.



W. S. EATON.

PNEUMATIC SHOCK ABSORBER.

APPucATloN FILED JULY 21.1917.

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Patented Dec. 31, 1918.

INVENTOR Warmen'o m. f mmv@ AM ATTORNEYS lmaaien s. EATON, or PLAINFIELD, new JERSEY.

Y PNEUMATIC SHOCK-ABSOBBEB.

Specification of Letters Patent.

` Patented nee. ai, reis.

Application led Inlv 21, 1917. Serial No. 182,061.

shock absorbers in which provision is made for cushioning both strokes of the plungerA or piston head, more particularly seeks to provide a simple inexpensive and elicient shock absorber in which the air holder is primarily charged or pumped up and recharged from time to time as .conditions may require.

One of the objects of my invention is to provide a jar cushioning means of the character stated, while adapted for any uses for which such devices are generally employed, is lparticularly well adapted for use in connection, with the struts or uprights in aeroplane structures for absorbing the shocks incident in making landings, &c., especially the rebound shocks.

With further objects in View that will hereinafter appear, my invention is an im-v proved pneumatic shock absorber that embodies the peculiar features of construction and novel arrangement of parts set out in the following description, specilically pointed out in the appended claim and illustrated in the accompanying drawings, in which:

Figure 1 is a diagrammatic side elevation of a hydroaeroplane and indicatesv a practical application of my invention.

Fig. :2 1S a vertical section of my'improved shock absorber, the parts being in a normal.

position with the air inthe primary and secondary air chambers. held balanced through the small air passages in the main valve, and f Fig. 3 is a similar View of the parts showing their position when in the act of absorbing a shock.

ln the practical embodiment of my invention, I provide a cylinder of suitable Size,

one end of which is open and the other end preferably formed with a dome-shaped closure, in practice, securedby riveting, brazin or otherwise to a supporting member 1 whic may be atubular brace or standard for a hydro-aeroplane structure, as indicated in Fig. 1, the portion 1a of which forms a part of the compression means hereinafter specically referred to.

Cylinder 1 is formed with a primary air chamber 3 and a secondary air chamber 2, the

-latterbeing equipped with an ordinary type of tube filler valve 19 through which the air chambers of the cylinders are charged with air to a desired pressure and through which air in the cylinder may be readily drawn of.

The primary and secondary cylinders are formed by a division plate 9' provided with an annular external rim iiange 90 thatthreads vinto an internal threaded rim flange 1* formed or otherwise made fast on the inner faceof thecylinder 1, as is clearly shown in Fig. 2, by reference towhich it will be also seen that the plate 9 has a central valve seat of a relatively large diameter for receiving a ,valve 6 that is quick acting to its open position and which is normally held closed onto the Seat 9n by a coil spring 7that is located around the valve stem and seats against a valve guide 4 mounted on the division plate 9 and formed with elongated openings 5-5 for ,the passage of the air therethrough.

At this point, it should be stated, under normal condition, the pressure of the spring 7 is justsuliicient to hold the valve 6 closed down on its seat, since the air pressure in the two chambers, under ordinary conditions, is uniformly distributed by reason of the two chambers being in constant communication through small ports 8 in the valve 6, as shown. v

- The lower endof the cylinder is externally f l'threaded for-receiving a retaining ring nut 18 which encircles the relatively stationary cured to the piston by screws 12a, as shown.

The parts ,constituting my construction of shock absorber being at rest, as indicated in Fig. 2, and the cylinder l having received the charge of air up to a desired preure, through the charging valve 19, any jar or shock on `the relatively stationary part 1a of the supportingmember ,causes the cylinder to move down along the said supporting member or portion 1a and which movement is cushioned lby the air in the cylinder, the

compressed air in the primary cylinder lifting the valve 6, now flows quickly, according to the extent of the Shock, into the secondary or upper cylinder 2, it being understood that upon the rebound of the cylinder 1, the air above the, valve 6 4instantly closes the said From the foregoing description taken in connection with the' drawing, the complete arrangement, the manner of operation and the advantages of my invention will be readily apparent to those skilled in the art to which it appertains.

What I claim is: t

In a pneumatic shock absorber, a relatively stationary closed piston and arelativelymovable cylinder in which the piston operates, said cylinder having a diaphragm above the piston ldividing the cylinder into anv upper and a lower air chamber, a valve seat member secured to said diaphragm, a quick-acting valve coperating with said seat member and adapted to open into the 4') chamber farthest from the piston, said valve member' having slot return air passages whereby the air from the chamber farthest yfrom the piston may be slowly returned to the chamber adjacent to the piston after the 4" valve is seated, a one-Way chamber valve mounted on the cylinder-and in communication with the chamber farthest from the piston through which air can be automatically drawn into said last-named chamber, a piston rod connected to said piston, a cap on the end of said cylinder having an 'aperture through which the piston rod passes, a Stop ringA on said piston. rod within the cylinder and a rebound shock absorbing packing ring located 4within the cylinder and surrounding the piston rod and lying between said cap and said stop member.

WARREN s. EATON. 

